Twin Peaks from Portola – Weather Forecast
San Francisco, CA, US
This page shows a route-based weather forecast for the Twin Peaks from Portola cycling climb in San Francisco, CA, US. Unlike a simple location forecast, conditions are calculated at every point along the climb — from the base to the summit — using the actual route profile and elevation data.
You'll see hour-by-hour temperature, wind speed and direction, precipitation probability, and cloud cover adjusted for altitude. Choose your planned departure time to align the forecast with your ride.
Twin Peaks from Portola
Plan Your Ride
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Calculating weather along route...
Trip Summary
Forecast A
Trip Summary A
Forecast B
Trip Summary B
Weather Display Options
Forecast A - Route Map
Forecast B - Route Map
Compare Reversed Route
Same departure time & speed — opposite direction
→ Original Direction
← Reversed Direction
Creates a new saved route in the reversed direction
Route Map
Elevation Profile
Temperature Along Route
Precipitation & Precipitation Probability Along Route
Wind Along Route
Humidity Along Route
Pollen Along Route
UV Index Along Route
Start place details
Weather Forecast
Hourly around Mon 07 Sep 04:56
Climate Overview
| Month |
Temp Day
|
Temp Night
|
Sunny Days
|
Sun Hours
|
Rain Days
|
Precipitation
|
Humidity
|
UV Index
|
Day Length
|
|---|---|---|---|---|---|---|---|---|---|
| Jan | 13°C | 6°C | 27 | 8.1h | 2 | 20 mm | 75 % | 2 | 9h 54m |
| Feb | 13°C | 7°C | 17 | 6.8h | 13 | 142 mm | 73 % | 3 | 10h 49m |
| Mar | 13°C | 8°C | 27 | 9.6h | 16 | 99 mm | 70 % | 4 | 11h 59m |
| Apr | 14°C | 9°C | 29 | 11.3h | 8 | 15 mm | 68 % | 5 | 13h 12m |
| May | 15°C | 10°C | 31 | 13.2h | 3 | 4 mm | 65 % | 6 | 14h 13m |
| Jun | 15°C | 10°C | 30 | 12.5h | 1 | 0 mm | 67 % | 7 | 14h 43m |
| Jul | 15°C | 11°C | 30 | 10.9h | 5 | 3 mm | 66 % | 8 | 14h 27m |
| Aug | 17°C | 12°C | 31 | 11.6h | 3 | 1 mm | 68 % | 7 | 13h 33m |
| Sep | 19°C | 14°C | 27 | 10.0h | 8 | 7 mm | 70 % | 5 | 12h 23m |
| Oct | 18°C | 12°C | 26 | 8.9h | 11 | 39 mm | 72 % | 4 | 11h 11m |
| Nov | 15°C | 10°C | 23 | 7.8h | 11 | 103 mm | 76 % | 2 | 10h 8m |
| Dec | 12°C | 7°C | 21 | 6.7h | 10 | 125 mm | 77 % | 2 | 9h 36m |